living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Chelicerata Heymons, 1901
             Class Arachnida Lamarck, 1801
               Order Pseudoscorpionida Latreille, 1817 - false scorpions see Order Pseudoscorpiones De Geer, 1778
                 Superfamily Chthonioidea Daday, 1888
                   Family Chthoniidae Daday, 1888
                     1 Genus Pseudotyrannochthonius Beier, 1930
                     2 Genus Lechytia Balzan, 1892
                     3 Genus Mexichthonius Muchmore, 1975
                     4 Genus Chthonius Koch, 1843
                     5 Genus Troglochthonius Beier, 1939
                     6 Genus Aphrastochthonius Chamberlin, 1962
                     7 Genus Kleptochthonius Chamberlin, 1949
                     8 Genus Tyrannochthonius Chamberlin, 1929